CVE-2026-40544: Soplanning

Medium severity, CVSS 5.1. EPSS: 0.4% chance of exploitation in the next 30 days.

SOPlanning is vulnerable to Stored Cross-Site Scripting (XSS) via /process/upload_backup endpoint. An authenticated attacker with access to the backup functionality can upload a crafted ZIP archive containing a malicious user.csv file with embedded JavaScript. The injected code is executed in the victim’s browser when a user clicks the Edit button for the malicious backup. This issue affects SOPlanning version 1.55 and below.

Affected products

• Soplanning Soplanning: up to and including 1.55

Published 2026-06-01. Last modified 2026-07-22.